3.5mm Plug Headset Microphone Head-mounted Portable Lecture Teach Headset Mic Voice Amplifier Lightweight Over Head for Teachers

High-concerned chemical : None Built-in Battery : No Communication : Wired Set Type : Single Microphone Transducer : Condenser Microphone Use : Teaching Style : Lavalier Microphone Brand Name : MOONBIFFY Origin : Mainland China Certification : CE,RoHS